package network;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: WHY
 * Date: 2023-04-07
 * Time: 21:16
 */
public class TCPEchoClient {
    private Socket socket=null;

    public TCPEchoClient(String serverIp,int port) throws IOException {
        //这个操作相当于让客户端和服务器建立tcp连接
        //这里的连接连上了,服务器的accept就会返回
        socket=new Socket(serverIp,port);

    }
    public void start(){
        Scanner scanner=new Scanner(System.in);
        try(InputStream inputStream=socket.getInputStream();
            OutputStream outputStream=socket.getOutputStream()){
            PrintWriter printWriter=new PrintWriter(outputStream);
            Scanner scannerFromSocket=new Scanner(inputStream);
            while(true){
                //1.从键盘上读取用户输入的内容
                System.out.print("->");
                String request=scanner.next();
                //2.把读取的内容构造成请求,发送给服务器
                //注意,这里的发送,是带有换行的
                printWriter.println(request);
                printWriter.flush();
                //3.从服务器读取响应
                String response=scannerFromSocket.next();
                //4.把响应结果显示到控制台上
                System.out.printf("req: %S; resp: %s\n",request,response );
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
    public static void main(String[] args) throws IOException {
        TCPEchoClient tcpEchoClient=new TCPEchoClient("127.0.0.1",9090);
        tcpEchoClient.start();

    }

}
